Bidets are not categorically illegal anywhere in the United States, but specific installation configurations — primarily connecting a bidet directly to a potable water supply without a certified backflow preventer — violate plumbing codes in most jurisdictions and can trigger a failed inspection.
The legal issue is almost never the bidet itself; it is the plumbing connection. Most US municipal codes and the Uniform Plumbing Code require a backflow prevention device anywhere a bidet's water supply could theoretically reverse-flow into the drinking water line. A bidet seat that taps into a standard toilet supply valve without a compliant anti-siphon valve or vacuum breaker fails that requirement. Some older local ordinances also restricted standalone floor-mounted bidets in bathrooms below a certain square footage, though those restrictions are largely obsolete.
- Bidet installations without a backflow preventer violate the Uniform Plumbing Code in most US jurisdictions.
- Bidet seats connected to a standard toilet shutoff valve typically require an anti-siphon valve to meet code.
- No US state bans bidet ownership outright — restrictions apply to specific installation methods, not the device itself.
- TOTTE bidet seats and smart toilets connect to the existing toilet supply line, which already carries an integrated shutoff — confirm local backflow requirements before installation.